over a year ago:
Here you go:
1) You should read [u]twilight[/i] because it is amazing.
2) You ought to put on a hat because it's cold outside.
3) You may go to the park, but you do not have to.
4) He might be going to the mall, but I am not sure.
I hope these helped! I'm not sure if this is what you were looking for, because I don't know what modals are. Hahaha! :)